Fuse



9, 1943- c. LA MAR 2,333,942

4 FUSE Filed Sept. 9, 1941 ATTORNEY indicator.

-ence designate corresponding the several views, and in which: l v d vFigure 1 is an elevational view. partly ln.sec-

' my invention.

Patented Nov. 9, 1943 TE u TAT S OF IC j 511,,

-*rrsnkc nmasrucsomml-.fj c r Application September 9, IMlf SeI-ial'No.410,122 i l some. (01.2064121). V M

' This invention relates to fuse'clips, particularly to fuse clips forcartridge type fuse and more particularly to a .combinedficlip and It isWell knownto those skilled in the fuse clip art that when an extremelyheavy explosion or concussion occurs near a fuse 'clip, especially insuch places as warships," the fuse in the fuse clips is likely .to beeither thrown from the clips in which it is held or forced down into theclip in a practically inoperative position. i

A principal object of this invention is to provide a clip combined withan indicator which shall be so constructed and arranged that both' thefuse and the indicator will be so held that neither will b thrown fromoperative position by a severe explosion 1ori concussion in theimmediate vicinity thereof.

A further object of the invention is the con struction of a device of tle'type specified which will be simple in construction, easy tomanufacture, convenient to install, low in cost, and easy to maintainand use. f

' Other objects and advantages will appear as the description of theparticular'physical embodiment selected to illustratethe inventionprogresses and the novel features will be larly pointed out in theappended claims.

In describing the invention in detail and the particular physicalembodiment selected to illustrate the invention, reference will .be hadto the accompanying drawing; and the several views thereon, wherein likecharacters of. referparts throughout tion, of a device embodyingmyinventiongjl fig. 2 is a view of the device as shown by Fig. 1 as seenfrom the left hand end thereof; Fig. 3'is a crosssectional view of thedevice as shown in Fig. 1 on the plane indicated by the 1ine.III -;IIIof Fig. 1, viewed in the direction of the arrowsat the ends of the line;'Fig. 4 is a fragmentary cross-sectional view of the device as shown byFig. 2, on the plane'indicate'd by the line IV.-IV

particuof Fig. 2, viewed in the direction of the arrows at the ends ofthe line; Fig.5 is a top plan view of an indicator alone used inconnection with has no novelty in and of itself or incombination with myinvention as it is merely illustrative of a mounting plate. r. Thismountingjplate should,

sulatingfmate'rial. H W The usual and ordinary cartridgefuseof commerce,as shown in Fig. l, is designated'l, This fus'e', as is usual. isprovided with usual metallic capsf3 and 4. It is understood that withinthe interior-pf" the cartridge; 2 is the usual fusible link electricallyconnectingthemetallic' caps 3 and}, but the internal construction of thecar tridgefuse is nopart of my invention.

As most clearly shown in" Fig. 2,. themetallic caps, as 3 a'nd'4,arepositioned between the legs of substantially Ushap'ed spaced clips 5and 6. A vU-shaped clip, as 5, has each. leg formed for a portion of itslength into substantially thearc of a 'circleas I. The radius of thiscircle should be substantially the radius. .of. the outside diameter ofa cap. as 4. The two-1egs,.as 8 and 9, of the clip areso formed and sopositioned that before the positioning of, a fuse. cap, asf4 therein,they are somewhat nearer togetherthan as shown in Fig. 2 so thatwhen-the cap, as 4, isforced thereinthe two legs as 8 and S are forcedapart and bear resilientlyagainst the outside surface of a pra-s4. Thematerial of which the clips, as 5, is made can be any of the usualmaterials used for such. purpose, such a spring brass.

Each of the clips, as 5 and 6, also has on each of course, be. made asis usual; of d a suitable inof the legs, as 8 and 9, teats, as llland ll-, best of the cartridge fuse Zendwise.

Each clip, as 5 and 6, also has a combined fuse indicator and holdingstandard, as l2 and I3 positioned on the-far side thereof. v Thesestandards, as '12 and-l3,zare preferably integral with the. clipswithwhich they are associatedandinternie'diate the legs of the clips.Infactthey may be struck out-of the same sheet of metal from which theclips, Lasi; are. struck and then bent up .into the form as shown inFig.2yjust as the legs 8. and '9 are bent up to-the form asishown in Fig. 2.These standards-as 1.2, extend out from the base, as M, of aclipand thenupwardly, forwardly of the ends ,of the legs of, the clip, as

shownin Fig. 1.. The standards, as I2, are, however, positioned suchthat the outside face, as l5, issubstantiallyin line with the outsideface of the teats, as In and u, so that the: fuse and fuse clipstogether occup ysubstantiall y no more space. longitudinally thanordinary and .well known'fuse clips; f

The fuse indicator and holding standards l2 and I3 each has means at itsupper or free end by which to attach a fuse indicator. In the form shownin Fig. 1, standard II has a rectangular slot IS in its upper end andstandard I3 has a circular perforation ll therein connecting with anarrowed slot I8 opening in the upper face I9 of the standard I3.

Between the standards l2 and I3 there is positioned a fuse indicator.This fuse indicator, in outward form, is an elongated member, preferablya cylinder 20, formed of insulating material,

as best shown in Fig. 1. At one end thereof and suitably attachedthereto, is a tongue 2| having I a right angle bend intermediate itsends. At the other end, the fuse indicator is provided with a plug 22provided with an internal thread 23. A stud 24 is provided havingexternal threads 25 formed on the outer surface thereof for a portionofthe length of the stud. The stud also has a reduced diameter or a narrowneck at 25 and an enlargement or collar at 21. The narrow pack 26 iscfisuch diameter that it may be moved downwardly through the slot 18 asshown in l'ig. 3. The collar 21 is of such diameter that it just neatly'or substantially fits into the perforation or orifice ll. The stud 24has an insulating handle or knob 28 fastened rigidly thereto in anysuitable or appropriate manner, as by a pin 23, for turning the stud.After the stud is inserted in the plug 22, the end '55 is spread so thatthe stud cannot be removed and so lost.

By the construction 'hereinbefore described-it will be readily apparentthat a cartridge fuse,

as 2, in the absence of the indicator 20, maybe pushed into the fuseclips, as and 3, to take the position as shown in Figs. 1, 2 and 8. Thenthe fuse indicator 'mayhave the end of tongue 2| entered into the slotl8 by holding the indicator about at a right angle to the fuse2 and thenbringing it "down towards parallelism with face 2 whereupon the narrowneck' 26 may be passed through the slot I8 and then'the collar 2! movedinto the perforation H by turningthe knob 28 which causes the screwthread cooperating with screw thread 23 to advance the stud into thecollar 22 until the knob 2'3 seats firmly against standard ll andperhaps collar 2! seats against collar 22-. I

When the fuse indicator -or integrity inQlcI/t'or 20 is in positionabove, the fuse 2, .as shownin Fig. 1, if any concussion occurs in thevicinity of the fuse 2 tending to throw the outof the fuse clips towardthe fuse indicator, the fuse indicator will act as a holder and preventthe fuse from being thrown from its clips.

Any suitable or appropriate Items may be used for supporting the clips,:as I and 0, at a suitable distance apart and in proper alignment. Iprefer to support the clips, as i and, W011 conducting "blocks 30 and2|, respectively. Clips 5 and 6 may be attached elwtrically andmechanically to blocks 30 and 3| in any suitable and appropriate manner,but if prefer to dorm orifices, as 32, in each of the clips "and to passa screw threaded headed member, as .33, through the orifice into a screwthreaded cavity 24 of "the block, as 31). This construction not onlygives a firm and secure attachment of the clip to the block but it also,if a proper screw is used, such as a fi-lister head, provides anabutment at each of the clips, on the bases thereof, which is of greatimportance. This head, as '35, is made of such a height that it comesavery short distance of a cap, as 4. As there are one of theseresistance.

screws at each end of the fuse, if concussion occurs, tending to drivethe fuse downwardly, as viewed in Fig. 1, that is, into the fuse clipsinto an inoperative position, this motion is prevented by the heads, as35, of the screws, as 33, so that undue inward motion cannot take place.

By the construction described, it is evident that a concussion, blow orexplosion adjacent the fuse cannot operate to jar the fuse out of theclips, outwardly or in an upward direction, as shown in Fig. 1, ashereinbefore explained, nor can it jar the fuse out of the clips into aninoperative position, by reason of the abutment provided by secured tothe desired surface in any suitable or appropriate manner, but it ispreferred to form a screw threaded portion, as 36, on each which willserve to go through an orifice, as 31, in a mounting plate andafiordmeans for securing to the mounting plate by a nut 38 and a furtherlock nut, as'39.

The indicator itself, best shown in Fig. 4, includes an elongated hollowbody 43, preferably in the form of a hollow cylindrical tube having asight opening 4|. Just beneath the sight opening 4| there is positioneda lamp 42. This lamp may be of any suitable or desired type and form butit is preferred to use a lamp of the discharge type having twoelectrodes, as 43 and 44, therein which argon or both. There are leadwires, such as 45 and 46 issuing from the lamp. One of these lead wires'45, connects to one end of a resistance 41 of the grid leak type of theorder of 50,000 ohms The other end of the resistance being connected bya conductor 48 to the metallic electrical conducting sleeve 22. Theoutlet wire 46 connects to the tongue 2| which is made of ametallicelectric conducting material, such as copper or brass.

The sleet/e22 may be held with'inthe end of the tube 40 by any suitableor appropriate means but I preferto form acavity, as 49, in the sleeve22 and a cavity 50 in the tube 40 and to then drive a drive screw 5|through the opening in the tube 40 into the cavity in the sleeve 22.

The tongue 2| may be held in place in the end of the tube 40 in anysuitable or appropriate manner but applicant prefers to hold it thereinby means of a rivet, as 52, passing through the wall of the tube '40 andthrough the material of the tongue 2| but it is entirely feasible toomit the rivet and to hold the tongue'2'l in the end of the tube "40merely by means of the closure 53. This closure 53 is put into the endof the tube along with the tongue 21 and when pushed home can well berelied upon to hold the tongue in, place because the closure 53 I preferto make of a comparatively soft rubber having considerable resiliencyalthough I do .not mean to exclude the use of amuch firmer material suchas hard rubber for closing one end of the tube 40. The lamp 42 is heldin place by the lamp holder 54 which is that is, a fllister head screw35 for preventing 'inward'movement of the fuse 2,, .I do not therebyintend to exclude any other form of abutment I mean to exclude otherspecific forms of fuse indicator which may be provided and which may beso constructed as to have the ends attached fixedly but manually movablefrom the standards, as l2 and I3.

It is further to be understood that although I haveshown the member 20as being a fuse indicator'it might well be free from any indicatingproperties, that is, a member such as 20 could well be used merely as afuse holder, and the body simulating applicants fuse indicator mightwell be a plain cylinder or other suitable form fixedly attached at eachend to the standards as l2 and I3 merely to prevent the fuse from beingshaken from the clips. Applicants fuse indicator could act merely as afuse holder by omitting the lamp 4| and its connections.

Although I have particularly described a par- 1 ticular embodiment of.my invention and explained the principle, construction and mode ofoperation thereof, nevertheless, I desire to have it understood that theform selected is merely illustrative but does not exhaust the possiblephysical embodiments of the idea of means underlying my invention. I

What I claim as new and desire to Letters Patent of the United States,is: e

1. A cartridge fuse holder, including, in combination: two spacedsubstantially U-shaped clips, each adapted to receive and hold an end ofa secure by cartridge fuse; standards, one on each clip andpositioned'on the far side of each and each standard extending forwardlyof the ends of the legs of the U clip, one standard formed with a slotadjacent its free end, the other formed with an orifice connected by aslot of less width than the orifice opening in the face of the free end;an elongated member; a' tongue protruding from one end of the elongatedmember insertable in the said first mentioned slot; a plug formed witha,

through screw threaded bore in the other end of the elongated member; anexternally screw threaded stud engaging the screw threads of the plug,said stud formed with a reduced diameter portion and with anenlargement, the said enlargement substantially fitting the orifice inthe standard and the reduced diameter portion passable through the slotconnectingwith the orifice whereby the elongated member may bepositioned fixedly between the standard and serve as a holder to preventthe fuse from moving out of the clips, means carried by the elongatedmember to indicate the integrity of the fuse.

2. A fuse indicator, including, in combination: a hollow elongated bodyprovided with a sight opening; a metallic electrical conducting tongueprojecting from one end of the body; a metallic electrical conductingplug in the other end of the body, said plug formed with an internallythreaded through bore; an externally screw threaded metallic studthreaded into the plug, said stud formed with .a reduced diameterportion and an enlarged collar; an electric lamp within the body at thesight opening; means for electrically connecting, said lamp to thetongue and to the plug and means for electrically connecting said tongueand said stud to a fuse clip containing a fuse whereby the integrity ofthe fuse may be indicated.

FRANK C. LA MAR.

